01 - Rinse rice under cold water until clear. Combine rice, water, and salt in a saucepan. Bring to a boil, reduce heat to low, cover, and simmer for 15 minutes until water is absorbed. Remove from heat and let stand covered for 5 minutes.
02 - In a bowl, whisk together soy sauce, gochujang, brown sugar, sesame oil, rice vinegar, garlic, ginger, honey, and red pepper flakes to form the marinade.
03 - Toss beef slices in cornstarch until evenly coated. Add half of the marinade, mix well, and let marinate for 10 minutes, reserving the remaining marinade.
04 - Heat a large skillet or wok over high heat. Add marinated beef and stir-fry for 3 to 4 minutes until browned and just cooked through. Pour in reserved marinade and cook for an additional 1 to 2 minutes until sauce slightly thickens.
05 - Fluff cooked rice and divide evenly among four bowls. Arrange beef, carrot, cucumber, and kimchi atop the rice.
06 - Sprinkle scallions, toasted sesame seeds, and optional nori strips over the bowls. Serve immediately.